Portion of a modem



FIG. 1 is a top, front and right side perspective view of a portion of a modem showing my new design,

FIG. 2 is a front elevational view thereof,

FIG. 3 is a top plan view thereof,

FIG. 4 is a bottom plan view thereof,

FIG. 5 is a right side elevational view thereof, a left side elevational view being a mirror image thereof; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a portion of a modem, as shown and described. 